2. Just a creative name for a threesome :)
Origin of this word: a better word was needed to replace threesome, and since a lot of riding goes on in one (in more than one way) this term thus came to be.
Pedal tricycles can either be upright much like a common bicycle or can be recumbent. Most upright tricycles tend to have have two wheels at the back (frog) where as the recumbent variety more commonly have two wheels at the front (tadpole).
"Nah, I'll let you and Haley hang out alone, I'd just be too tricycle."
Man, whenever Joe hangs out with us, he's always the tricycle in the group.
Lunchbox: Oh yeah! I'd love to get it on tricycle style with those bitches.